Why are historians not sure if Trojan War really happen?

Question: Why are historians not sure if Trojan War really happen!?
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I watched a documentary on this :P
The untrue story of Achilles was written by Homer a Greek philosopher who possibly lived around 850 BC!. It was a type of book to be sold, much like our Authors do today!. Upon examining the contents of this book, modern day Professors discovered where the alleged Trojan war took place!. Excavators and Archaeologists searched thoroughly at the site of this supposed epic event for clues or some type of weaponry to indicate a past conflict!. Nothing could be found, not even the stone walls of the fortress or the slightest bit of evidence that anything existed!. It was as if it was a baron land!. Nothing could be proven from Homer's writings and no physical aspects could be recovered!. Simply, they summed the end of this documentary up with "Homer was probably just a very good story teller"!. So in reality, it was just a novel designed to sell for profit purposes!. Amazing isn't it!?Www@QuestionHome@Com